Digital compositing

CS 248 - Introduction to Computer Graphics
Autumn Quarter, 2000
Marc Levoy
Lecture notes for Tuesday, October 24

Table of contents:

• Definition of digital compositing
• 1-bit matte
• 8-bit matte - the alpha channel
• Using alpha channels in rendering
• Derivation of the OVER operator
• The assumption of uncorrelated mattes
• The compositing algebra
• Premultiplied alphas